Mid-Cenozoic SHRIMP U-Pb detrital zircon ages from metasedimentary rocks in the North Patagonian Andes of Aysén, Chile

Quezada, Paulo; Hervé, Francisco; Calderón, Mauricio; Fanning, Mark; Pankhurst, Robert; Godoy, Estanislao; Urbina, Octavio; Suárez, Rodrigo. 2021 Mid-Cenozoic SHRIMP U-Pb detrital zircon ages from metasedimentary rocks in the North Patagonian Andes of Aysén, Chile. Andean Geology, 48 (1), 54. https://doi.org/10.5027/andgeoV48n1-3282

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Official URL: http://dx.doi.org/10.5027/andgeoV48n1-3282

Abstract/Summary

Previously undated low-grade metamorphic rocks from the Puerto Cisnes-Queulat area (44°30’ S) contain detrital zircons of mid-Oligocene age (ca. 28 Ma). Their outcrops represent the easternmost occurrence of the late Oligocene to early Miocene marine volcano-sedimentary Traiguén Formation; previous correlation with the Paleozoic metamorphic basement of this sector of the North Patagonian Andes is thus refuted. A similar age and provenance were obtained for a paraconglomerate bed of the La Junta Formation ca. 80 km to the north, which is thought to represent a high-energy lateral facies variation of the Traiguén Formation. Miocene plutonic rocks of the North Patagonian Batholith intruded these metasedimentary rocks, generating a contact metamorphic aureole that reaches biotite grade and overprints a previous metamorphic fabric probably formed during closure of the Traiguén Basin. Similar young ages for metamorphic rocks located immediately west of the Liquiñe-Ofqui Fault Zone 300 km north, near Ayacara, suggest a regional pattern of earliest Neogene metamorphism and rapid exhumation in this segment of the Patagonian Andes.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.5027/andgeoV48n1-3282
ISSN:	0718-7092
Date made live:	13 Apr 2021 11:00 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/530042

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.5027/andgeoV48n1-3282

ISSN:

0718-7092

Date made live:

13 Apr 2021 11:00 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/530042